function ExpandTech(expandID, collapsID, containerID) {
    InvertVisibility(expandID);
    InvertVisibility(collapsID);
    InvertVisibility(containerID);
}
function InvertVisibility(nodeName) {
    var elem = document.getElementById(nodeName);
    if (elem.style.display == 'none')
        elem.style.display = 'inline';
    else elem.style.display = 'none';
}